There is software out there that will attempt to recover lost raid volumes but it is hit or miss. It is worth a shot if you really need the data.
I have used this one with some success.
http://www.runtime.org/raid.htm

FYI - The RAID configuration for an array is only stored on the disks and not on the controller, hence you can replace the controller with an identical model and still boot of the drives.
Have you lost all the drives to failure, or have you lost at least two?

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